Question about installation of here 3 gps

Here GPS
1

hello all. I have here 3 gps and pixhawk cube.

I heard several years before that gps should be installed 2~3 degree angle different with IMU because of toilet bowl effect.

is it also valid on here 3 gps?

or should I install it aligned right with IMU?

2

Definitely not true. Where did you read that?