I tested it in 3 battles in 3 different places of the map, and with these low mountains, in teh battlemap there aren't problems and there are small hills on which you can wait for an enemy assault, sure that the small rise will tire your enemy.

Anyway i made a screen



as you can see in the battlemap even if you fought in the mountains there aren't big slopes but some realistic ones and the big ones are only off the battlemap



the white stripe would be the slope with the normal mountains of the Vanilla map and of most of the others; as you can see there would be a big slope also in teh battlemap but with the low mountains we've done the big slopes are only out of it( black stripe)...

hope you understood, even if my english isn't so good