suptek Clamp-on Speaker Stand Desk Mount Set, Height Adjustment, Swivel, 9.6 x 8.8 inch Trays, Universal Audio Holders for Bookshelf Speakers, Elevated Sound, 2 Pack, Black, SDM001G

Look for a large speaker shelf or something with a strong clamp rated for the weight? like these https://www.amazon.com/suptek-Adjustment-Universal-Bookshelf-SDM001G/dp/B0FG6R9CG5?th=1