I see way too many battlestations with wrong monitor placement. Tweeters at ear level, speakers facing your direction, friends! :) : r/MusicBattlestations
A Beginner DJ's Guide To Monitors, Part 2: Positioning Your Speakers
A Crash Course to Room Acoustics and Studio Monitor Placement
Monitor Placement - Genelec.com
Enceinte de Studio : 5 tricks pour un placement idéal !