You sure about the bit about being able to withstand sniper shots on master?I’m fairly sure that’s not accurate. Healing Module increases your healing rate and it applies immediately. It doesn’t give you damage resistance or extra health so anything that can normally one shot you, will still one shot you. You can withstand more small arms fire like rifles, but only if the healingrate matches or exceeds the rate of damage you take.
But yes, Healing Module is very good and I always use it for Horde. Obviously the venom cads are redundant on Horde so that frees up space.
I also like using it in conjunction with Interogation and the resupply radius card and the JD Spotter Support artillery strike move. I flashbang a target to meatshield, and activate the Ammo Resupply as I run just for the healing buff so I can take a bit more damage in order to grab the meatshield.