How to make props stay on water

Hello. I am using EngineMod and i want to make a boat engine boat. I don’t want to use boat from HL2 vehicles because if i place props on it, it turns upside down and doesn’t work. Anyone got any tools/help ?

buoyancy tool should work.

'kay, I will try it out. Edit after i tryed it.
Edit:
Worked perfectly. Thanks !