might be smart to plaster once over the seams. just to build a little and to get a fiberglass tape so that it absorbs the movements. Then it is easier to get the tiles straight, otherwise there is a risk that the tiles right there can sink in extra but that's my opinion 
Totally unnecessary and the tape is only used when painting. There's no risk that the tiles sink in, unless it's some very thin mosaic.spjuth said:
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