On the website it says that you can install coolers with a length of up to 360mm, and when I look up the be Quiet silent loop 360 it has a length of
397 mm and the Crossair has a length of 473mm, which means I can't install it? Even though it is a 360?

Se three radiators can be installed in this enclosure.

Front (mm) 120, 140, 240, 280, 360
Top (mm) 120, 240, 360
Rear (mm) 140/120

But please have a look at the manufacturer's website which gives answers to all questions and more:
https://www.bequiet.com/en...