They are optimzied for rpg maker MZ! they should be MV compatible but its MZ what they're optimized for,
As for dimensions, off the box they are tuned to a 1280x720 16:9p resolution, but you can rescale the SV sheet battler to fit your dimensions by percentile amounts in your software of choice, for the skeletal animation exports, those can be easily rescaled through the note tag scalex/scale y settings!