MoveAnything is the top result when searching for "move". I haven't used in in many years, but it should be able to move the buff and debuff frames and, well,
anything.
There are also addons that modify the Blizzard buff frame, like
ShinyBuffs or
rBuffFrameStyler, that will let you move them in addition to making aesthetic changes.
Finally, there are lots of general buff frame replacements, like
PhanxBuffs (icons),
Raven (bars or icons), and
Elkano's Buff Bars (bars).