I'm a bit suprised that many have not seen work before with a float mount. Adams work is presented this way as well as John Sextons. I mount both ways, float or linen tape behind an over mat. If it is for a sale, the float mount is what I use with at least a 6 ply mat. For exhibits and other uses, I will tape mount because it is a lot less work than doing a really good float mount and allows reuse of mats.