Viscera Nanobots will heal a mech even if its health would be reduced to zero or lower. Even if you use Self-Destruct. This ability doesn't account for negative numbers, so if your mech's health has been reduced to a negative number, the game will just treat mech's HP as 0 and heal the according amount of HP. E.g. if your Unstable Mech has 1HP, has Upgrade I powered and kills two enemies in one attack, it will have 2HP after the attack resolution.
Abe Isamu's Armored ability will absorb 1 damage done to self when attacking with the Leap Mech or Unstable Mech.
All of this squad's weapons push enemies, so beware of inside corners, particularly where one of the obstacles is a city or allied unit, and either occupy them with your own mechs or prevent enemies from moving into them