When attacking with the Siege Robot there are several things you can do to get the odds in your favor. First, do not stay next to or nearby the siege robot!
The IKE assembly turret has a splash effect similar to Brock’s star power, and you are likely to be clipped by it as well as any other brawlers attacking the machine (Jessie, Colt’s super, e.t.c.)

Eliminate any opponents that may block your siege robot first!
The robot in this game mode is made to directly attack the IKE turret, and every second it spends inside its range without advancing will limit its lifespan.
Kill any bears, brawlers or super-charged Shellys that may slow it’s advancement.
Spread out once you enter the IKE turret’s range
It is a basic tactic to surround and overwhelm the opponent.
This will also ensure any attacks that hit multiple opponents will not hit your teammates, but will be more likely to hit your opponents.
Once your siege robot locks on, prioritize staying alive and dealing as much damage as possible.
Continuously damage your opponent’s turret, but also ensure any dangerous brawlers are too weak to fight you directly.
Leave the IKE turret’s range before your Siege Robot dies.
Dying to the IKE turret forfeits all your positional advantage.
By running back, you have already taken control of the middle and will be able to collects bolts/heal up before your opponents can give chase.
Never walk in front of your Siege Robot.
It’s the one that has 30,000 health and can live much longer taking 1000 damage a second. Not you.

When Defending Against a Siege Robot engage the robot as soon and as fast as possible
Without the robot, the opponents cannot deal massive damage to your IKE turret.
Similar to Robo Rumble, engage the enemy robot before it can get too close to your objective.
While engaging the robot outside of your IKE turret’s range in this game mode, prioritize staying alive over damaging the robot
If there is nobody to fight the robot, it will gain a lot of ground while you respawn.
If you cannot engage the robot, engage DPS brawlers first.
For characters with a short range (such as Shelly or Bull), it may be better to remove high DPS brawlers who are alongside the robot.
If they die, they may come back too late to support their siege robot.
Stall the robot within your IKE’s defense range as long as possible
This extends to body-blocking with a respawned brawler, knocking back or distracting the robot, or tossing tanks such as Nita’s bear and Penny’s mortar for it to fight.
The longer it is not on your IKE turret but within it’s range, the better.
When the enemy’s siege robot is about to die, start making your way for the center again.
Unless your IKE turret’s health is critically low, the faster you get to the center of the map after a siege the better of a chance you will have in collecting bolts.
Once the robot falls below 8,000 health, you can leave it to your IKE turret as you gain ground again.
Some brawlers can chip the IKE turret.
In a pinch, some long ranged brawlers can lightly damage the IKE turret in the Siege game mode.
It’s only recommended to do this when it’s below 20% health, as you are much more useful in collecting bolts.
Wave one requires 3/5 bolts to guarantee you will spawn a robot.
You can forfeit some bolts if they are too close to your opponent’s side in favor of closer ones, however, it is very situational. Bolts should be a priority.
These are all the tips I could collect after 1-2 hours of play, if you have any more please put them in the comments.
Best brawlers for bot drop
Bot drop is a game mode in which players compete to collect the most bots. The bots are dropped by a drone, and the first player to collect 10 bots wins the game.
There is no one definitive answer to who is the best brawler for bot drop. However, some bot drop best brawlers are better suited for this task than others.
For example, Bull is a great choice for bot drops because of his high health and damage.
Conversely, Piper is not as well-suited as one of the best brawlers bot drop because her attack speed is slow and she does not deal a lot of damage.
Ultimately, it depends on the individual brawler’s strengths and weaknesses as to who is the best brawler for bot drop.