The bottom of the filter housing is the return line to the oil pan, so there would be little, if any pressure on that one. Tee into the line that goes to the side of the filter housing, either at the block, or at the filter- - - -same pressure both places!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!