The Loose Association of Wargamers

I'm intending to double up my LMG's from now on x2 men to a base. I've found it tricky to see where they are in games so this would make them stand out from the rifle section. Question is x2 to a 30mm or 40mm round? (Prone teams a whole other issue and I tend to avoid them.)

I go for 30mm washers for 28mm.

30mm I’d say. Will be more flexible as well to fit into constrained terrain such as streets and houses

I either do mine on a 30mm round or a 25x50 pill base

If I had any, I'd put them on bases with four corners.

Does that make it easier to line the policemen up in front of them ?

Yes.