look at the core.lua of the stuf addon.do a search for
and you should find
Code:
uf:SetPoint("TOPLEFT", UIParent, "TOPLEFT", dbuf.x, dbuf.y)
change that to something like
Code:
uf:SetPoint("TOPLEFT", UIParent, "BOTTOM", dbuf.x, dbuf.y)
or better make an anchorframe perhaps 1x1 pixel and then move the unitframes with your anchor.
Code:
uf:SetPoint("CENTER", YourAnchorFrameName, "CENTER", dbuf.x, dbuf.y)
perhaps you need to adjust the x/y postioning, depends on how you do it