Germany
You can create so much map-entry-points as you wish, just copy them and set them where you like to. For a 2vs2 map I would recommend one map-entry-point for each side at the base and one near each base, which can be captured. But note, as OnkelSam said in his tutorial, every base-sector needs at least one map-entry point. In my opinion, the best way to find out if your map-entry-points work fine or not is to test your map by yourself in a skirmish.
Here are the Worldbuilder Guides from CoH2.org which might help you.
Relic Entertainment
cblanco ★ 
보드카 중대 
VonManteuffel 
Heartless Jäger 
