Edging for glass tile was just discussed recently. There are examples posted on the link below. There are other past threads about this too if you do a google search. Hope this helps

Here is a link that might be useful: trim for glass mosaic tile

Start at the corner and work your way back each way. Your link didn't work for me. We have glass and stone mosaic 5/8" squares. Sometimes you can fudge those last few pieces just a bit (cut the mesh) and narrow or widen the grout lines in minuscule amounts to have things come out even. If not, the cut end butts into the wall or inside corner. Hmmmm, unless you have staggered tile, then you need to look at Schluter metal edges to cover those cuts.

-Babka

Schulter edge. Comes in a few designs, and many finishes. I used stainless in my kitchen, brushed nickel in one bathroom, and white in another.

See photo towards the end of the link.

Here is a link that might be useful: Backsplash edged by Schluter.