I've put 4 x bikes on my 7 x 5, the 2 outside ones angled into the front corners and the third in the center backwards with the front wheel angled. Then we put an XR100 on the drawbar as well.
My next trailer will be the similar dimensions however I will enclose the mudguards in the tray and put a cutout in the front panel so the center bike is forward of the others

