When I was in my rock band, I purchased a TOA SM-68 non-powered monitor. It came with a bracket so I could mount it on a mic stand just to my left. It was great for hearing our vocals! I then became aware of the SM-25m, which was a powered monitor. Always wanted to try it, but was happy with the non-powered SM-68.-Mark
Very similar setup for me also .. Small Boss monitors in close and bracket mounted off of a cymbal stand.. I have one powered & one non powered.
(these are to assist pitch/levels for the vocal mix only)..
Drums & instruments go through the normal PA/foldback...
Cheers
John