New trap idea: Wall Traps!

Basically these are walls with relatively low HP, however they act like teslas in the sense that the only appear once troops are near. It will create a new dimension to the game where bases don't appear to be so linear and straight forward. The walls can spring up and seal an opening or funnel giants towards traps. I'm talking about 5-10 walls, not acting as an increase in number of walls (due to low hp) but as a new way break an attack with ingenuity rather than brute strength.