>>7267128They would work best with 1:48 models if they are realistically proportioned.
Warhammer (and warhammer inspired stuff from 3rd party companies) is usually not really 28mm in the original sense. They call it "heroic" scale. Depending on the models they can work with 1:35 kits just fine. 1:72 would be tiny.
Pic related is a Warhammer 40k imperial guard sdkfz (1:35).
If you are using smaller miniatures, (true scale 28mm) then 1:48 works best. I use alot of Warlord Games WW2 miniatures to go with my 1:48 vehicles for example.