The Fortis Manufacturing CONTROL Shield w/9mm Muzzle Brake should work fine with the barrel on the Angstadt Arms UDP9.
The Fortis Manufacturing CONTROL Shield w/9mm Muzzle Brake should work fine with a with a Foxtrot Mike FMP9. You will need to select the model that matches your barrel threads.
There are no suppressors compatible with the Fortis Manufacturing CONTROL Shield w/9mm Muzzle Brake.
Yes. The Kriss Vector uses 1/2x28 threads on the 9mm version which will be compatible with this Fortis Manufacturing CONTROL Shield w/9mm Muzzle Brake (MPN:BNDL-9MM-28).
Yes, the MPN:BNDL-9MM-28 would fit that firearm.
Unfortunately the manufacturer has not provided that information, even on their own site. We recommend contacting them directly, they should be able to provide you with that information. You can reach them here: https://fortismfg.com/index.php?route=information/contact
The diameter of the control shield is 1.49", so it will depend on the inside diameter of you handguard and whether you are trying to mount this inside the handguard.
The diameter is 1.49".