"Tank aggression" isn't a real thing- for one thing, moving your hungry snake to another container to feed may either put him OFF eating (if a shyer snake, due to the handling), OR, you may be more likely to get nipped, because you're handling a hungry snake (before feeding) or one that's still in "feed mode" (ie. pumped up to eat more) afterwards- & FYI "feed mode" can take hours or even a day or longer to subside- far more than would be advisable to leave your snake in a side container.
So yes, feed your snake in his own home- BPs are ambush predators & they do best when not interrupted as they lie in wait to pounce on hapless prey that passes by them.
But I'm glad you asked about safety...the BEST thing you can do is to get your snake on pre-killed prey BEFORE he gets injured, because sooner or later, that will happen. Rats are tough opponents & object to being dinner- they can turn just enough to bite back- and way faster than you can ever intervene, so even if they "lose" the battle, your snake can be seriously injured, requiring vet care. Also, domestic rats are intelligent & affectionate pets- so feeding only humanely euthanized rodents is just a much better way to go.