If you spread them out you can easily smoke the second one, the smoke has a huge range. I really dislike mg versus USF especially, 1 max for the Support of your grens to take one rifle squad out of fight (you should not Focus the Pinned squad because they get a Def Bonus)
Edit: but I see your point, in 2v2 several mgs can be viable
As wehrmacht you can't realy do much from infantry point of view. Of course you can rely on hmgs and mortars, they are good, but you will lack a very important feature: mobility. Which, can be provided only by the weak core infantry. Wehrmacht mortars are not what they were anymore so it's realy not worth it to have a turtle-like start.
So I prefer to spam grenadiers and back them with an mg OR a sniper. If you are decent at sniper play, this is the best way to go in my opinion. Further, though the Scout car was built to chase snipers, it can't realy chase anything ( and especialy the british sniper who can shot, disable the gun, then scram - woo-haa, what a balanced sniper being able to block it's verry counters lel), because of poor durability so if you don't desperately need it, just don't build it. Anyway against brits it's not worth building any kind of light vehicle because it will be enough to stumble upon a Bofors or take a double mortar hit and it's gone like smoke and you threw a much needed cup of fuel to garbage. From T2 pak40s are still good and if you have enough amo even a squad of pzgrens in order to be upgraded with shrecks. Then, if your opponent it's a noob you can fuck around like this until T4 with some mines in addition, if not, you will probably lose, but anyway go for stugs, they will help you hold the line. For a while.