You will need 10 of these strong magnets, these come with the double sided tape for the 5 that stick under the glass.
So 3 sets down the center from front to back and 2 sets on each side closer to the center pillars. You can paint these or use a black sharpie marker.
LOVIMAG Super Strong Neodymium Disc Magnets, Powerful Rare Earth Magnets - 1.26 inch x 1/8 inch, Pack of 6 https://www.amazon.com/dp/B089CVX89D/ref=cm_sw_r_cp_api_i_KZ3BXTTE4G4VE7DNTP5F?_encoding=UTF8&psc=1
So 3 sets down the center from front to back and 2 sets on each side closer to the center pillars. You can paint these or use a black sharpie marker.
LOVIMAG Super Strong Neodymium Disc Magnets, Powerful Rare Earth Magnets - 1.26 inch x 1/8 inch, Pack of 6 https://www.amazon.com/dp/B089CVX89D/ref=cm_sw_r_cp_api_i_KZ3BXTTE4G4VE7DNTP5F?_encoding=UTF8&psc=1
