Its always safer to strap up, never know what you'll catch out here.
Edit: Oh.. I'm out then. I'd rather unstrap them and run .5 individually, just incase one were to bite the dust, so you could then temporarily have one amp. If one were to go, i'd honestly go .25 on the remaining amp assuming you have the electrical for it, since you'll have to replace one anyway, might as well get both updated versions.