I think the spawns are cheap on pretty much all the non BTB forge maps.
You either make dynamic spawns and place them right, or you let people spawn on their side of the map all the time and provide enough cover.
Like in the pit on H3 you could switch sides if the other team had over run your side, but only if they were on your side.
If they stayed on the middle you would keep spawning on your side.
Forge maps these days suck, you either spawn IN your tiny ass base or you spawn near team mates.