Sator palindrome square

SATOR
AREPO
TENET
OPERA
ROTAS
In Wikipedia, the translation is: Sator Arepo tenet opera rotas, that is, the Sower Arepo holds with difficulty the wheels. my first objection: opera could probably mean by experience, not with difficulty. Also, one can read here two sentences instead of one ( and this is not in Wikipedia): Rotas opera- Sator Arepo tenet: you rotate the jobs-the Sower Arepo prevents.
also, if you oconsider the prosody, it is like the following:
ˇ ˜
ˇ ˇ ˇ
ˇ ˜
ˇ ˇ ˇ
ˇ ˜, that is this is an alternation of iambus and tribrach. So what meter can that be?