The secret to using the filter box as a "channel" is to do it very slowly and adjust a little when you back the filter off enough for the oil to start flowing. Another real key is that once you have drained all the oil out make sure the old seal didn't come off the old filter. Now, go in the house, wash your hands really good and dry them good. Take the new filter, untouched by oily hands, apply that coat of oil to the seal, and then screw it down as tight as you can get it with CLEAN, DRY hands. Clean filter + clean hands = filter much easier to tighten. (I still snug it a little more with the wrench...just human nature). This is how I do my bike and all vehicles....have NEVER had a leak or seepage.
Something else that works well is a large turkey pan (aluminum, reusable..about $3). Get the one that is about 24" x 18" and you can actually drain all three holes at the same time and then do the filter last. The main thing is to just take your time and enjoy working on your own bike. Like I have said before...a little Creedence on the boom box and a cold brewski don't hurt either. It's all the mental thing of having fun while the bike is trying to piss you off.
p.s. this is my answer from an earlier thread about this basic subject. ENJOY working on YOUR bike. You won't be sorry.
Semper Fi,
Steve....Pensacola
USMC 1972 - 2003