There are no official base sizes in AoS. I'd suggest a 60mm round, but honestly whatever looks best to you is the "correct" answer. It might look good on one of the oval ones instead if 60mm is too small.
So long as the B model fits on the base, without leaving acres of space all around (avoid Archaon's base) then you're fine. Infantry benefit slightly from small bases but there's really no competitive advantage in base size for non-fighty models like artillery.
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