I mounted the WRBG2 light on my 90 cm tank using the brackets sold on the website and the lights hang diagonally. Are there any long term issues mounting the lights like this? Will it add too much stress to the glass?
It’s a normal phenomenon.
Your tank size is same as the light. So there is no space for the hanging baskets.
If your tank length is longer or light length is shorter, the hanging rope could be vertical.