get a mosaic trowel, the small notches and small space between them will ensure you get enough adhesive on the backs without too much squeezing through the joints.
Also worth using a decent adhesive such as BAL Mosaic-fix
Just wanted to give you a tip in case you were intending to use mosaics around a shower..... and the tip is to forget it - you'll be forever cleaning and re-grouting. Otherwise, knock yourself out.
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