I have a question about how these work. At tier 3, which is all I have access too at the moment, the general resistance mod grants +5-7.5% resistance to thermal and kinetic. The problem is, barring the thermal shield generator mod, shields have an innate -20% resistance to thermal. With lets say a +10% thermal resistance shield booster mod, would your shields be at -18% or -22% because they surely cannot be additive and bring you to -10%.
The reason I say it can't be additive is with tier 5 mods and 8 shield boosters, you can actually reach 100% thermal and kinetic shield resistance. If they were additive you would be invincible, if multiplicative - twice as effective. I tried to check myself but there is no direct stat for shield resistance, the stats on your shield itself don't reflect the changes of shield boosters.
The reason I say it can't be additive is with tier 5 mods and 8 shield boosters, you can actually reach 100% thermal and kinetic shield resistance. If they were additive you would be invincible, if multiplicative - twice as effective. I tried to check myself but there is no direct stat for shield resistance, the stats on your shield itself don't reflect the changes of shield boosters.