Despite SOV word order, it's not mandatory, and indeed often sentences where sum, esse is the only verb, Latin uses SVO.
Sometimes. From my understanding sum only follows SVO if it is being used as a equator, that is, if it is showing that x is/are y. A good way to think of it is to check and see if it acts like an equal sign, if so, SVO. If not, SOV.
Can we have Uxores quoque sunt benignae please? Reported.
I also thought this was a correct form.