Asrock b365m phantom gaming features 4 memory slots.
Check the guide to see if RAM needs sockets 2 and 4 instead of 1 and 3.
Slots 2 and 4 offer more stability during high clock speeds, yet they don’t affect performance at a specific speed or latency level.
You can place the RAM in slots 1 and 3 and it should work. At 1080p you're aiming for about 120 fps with your i9 9900 and RTX 3060.