Just changed my oil last night, the 27th time on the RV to be exact. I have a tray that I stick in under the filter from the side, and all it is is a piece of 2024-T3 sheet 18" or so long by 2" wide, with a crease in the center. Other end drips over the bucket underneath. Crack the filter open and walk away for an hour. Total cost: $0.00, considering the piece was scrap. Not a drop anywhere.
 
Oil tray

I have a tray like Rocketbob's and I punch a hole in the top of the filter at
the rear area (side) then rotate filter one half turn and let drain while I drop the oil from the sump. A rag under the filter catches the few drops that are left when removing the filter.

RV-4 flying 2 yrs.
370 hours