Well it would seem the biggest constraint here would just be moving these darn things. I wonder though, considering their height, weight, the doubling of speakers and size of cabinetry, would there not have to be some extra bracing here just to absorb the weight alone? Four tweeters, talk about bright sounding!
Also, looking at the picture and given the high center of gravity, I would think these babies would tip over quite easily if you accidentally bumped in to them.