I don’t know whether or not it is the “proper” way, but physical materials work on anything where you apply a material. So it can be done with a static mesh. When you break the hit result -> phys mat, that will give you the physical material you’ve hit.
Normally you can only have one physical material per material (no texture needed here, you just specify what physical material you want). Since that may be a limitation, with a physical material mask you’re supposed to be able to have several different physical materials applied to one material. But then of course you would need to specify where they are, and apparently you would do that via a texture. But I never used a physical material mask.