It's pretty hard to find a server with at least three other players playing this specific DLC map, so I did this solo on a custom ranked Swarm game. It’s hard, but doable. Just don't expect to finish this on your first try! Oh, and as you can see, it's a long read…
Go to Swarm, custom match and press X. Make it a ranked game with medium difficulty (unfortunately the lowest difficulty to count as ranked) and pick the right map.
For my loadout I used an Assault Rifle with Automation Mod and a Shotgun with Incendiary Rounds, the Riot Mortar and Repair Tool. I maxed out Composite Plating and put some points into Tungsten Coating, Gyro Stabilizer and Repair Field. A Rocket Launcher could also be a good idea for use against the Mechs and Bikes instead of a Shotgun.
Before you start hacking, press start, go to DCM and turn on VIP. This will force the VIP mission during the second third of the match, instead of the Recover mission. The VIP will then fight alongside you during the rest of the match.
The Control Point in this map is on a raised platform with two sets of staircases leading to it. To the southwest of the CP both staircases come together at their highest point. This is where I spent most of the match.
The first five minutes shouldn't give any problems, so just use that time to gather enough money for the next ten minutes. Place a Minigun Turret at the top of those staircases when you get $40. Just make sure it's just a bit to the side of the lamppost. The great thing about this spot is that the Turret can defend the whole southwest side of the map and overlooks the CP platform. Keep your turret healthy and when you earn your next $20, build a Supply Depot next to it. The bots should be defending the platform and the northeast side of the map. Whenever you've got another $40, build a Missile Turret next to your Supply Depot.
When the first five minutes are over there will be an airstrike wiping all enemies of the map. Use this moment to repair everything. The reason for building a Missile Turret is that during these next five minutes two Mechs will appear. You will need that Missile Turret to keep them busy and hopefully even kill them. I tried this using two Miniguns and a Supply Depot and died horribly. While the two Mechs are your main concern the map can get very crowded with enemies. Retreat a few steps down the stairs so you can keep repairing your Turrets and Depot if there are too many enemies shooting at you from the southwest corner. Pop back up when you're healed again. During this time the VIP mission should become available. In my experience the VIP is strong enough to finish the mission on his own, so I always ignored helping him.
When the map is wiped clean by the second airstrike repair everything and heal the VIP, but replace your Minigun with a second Missile Turret. During the last 2-3 minutes there will be three Mechs and they would decimate your Miniguns. Those three Mechs will be your main concern now. Try to keep them busy so the bots can focus on the regular enemies and defuse those hacks. Money should be of no concern now so if you keep dying just get back and place another Missile Turret until the time's up. If the CP gets hacked with less than 20 seconds to go, you've already won. The final airstrike will kill all leftover enemies, even Mechs and you should have enough time to defuse the hack.