Oddly, this stand has a depth of 43cm. Technics SL1200s (and a lot of other turntables) are 45cm in width, so if you orient them battle style they overhang the stand on the front and rear.
Modern mixers such as the Rane seventy will NOT fit if the rear of the stand is against a wall and the stand is not exactly solid, so if you're scratching or beat juggling you'll definitely need to secure it to a wall with brackets which are not supplied.
This might be a good stand if you're just mixing with controllers and a small mixer (and you can bear the high cost), otherwise look elsewhere.