I have a network of 3 Deco X20's (wired backhaul) but would llke to buy 2 more to extend wifi from my house to an outbuilding. The house has windows that face the outbuilding, and the outbuilding has a window that faces the house too. The distance between is 30m and completely clear. If I placed one Deco on the window sill in the house and another on the window sill of the outbuilding, do you think it'll reach? Would more expensive Deco models have better range, or are they all about the same?

Otherwise if that probably won't work I'd get a dedicated point to point bridge and then add a Deco to the end. That might be the more reliable, better performing solution anyway.