What size trowel for 12" tiles

1/4x3/8" U shaped?
These are thick porcelain tiles and have large voids on the back. Wondering if I would be better off back buttering them?
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Press one on and pull it off, evaluate the coverage and back butter if it is not good enough. It may hold well with voids but might crack due to lack of support. If this is an edge molding or similar, fill it up.

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Back butter them with the flat side of the trowel. The 1/4 x 3/8 trowel should be fine for 12 x 12 tiles.
thetiler
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thetiler wrote:

Does it matter if it's U, Square or V shapped?
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Square leaves more than U which leaves more than V but they all smoosh flat when you put the tile on.
Square and U are pretty close, V might not leave enough thinset

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