I mean, general consensus is that your legs should be parallel to the top of the bass drum or around that point, which leads to 90 degrees with a +/- margin...
Gretsh Renown Maple 10, 12, 14 and 16 toms, 22 bass drum, Yamaha, Spaun and Pork Pie snares. DW 9002 and Iron Cobra Powerglide double pedals. Many cymbals, here it is: