I have a HOB filter on my 8.5g rimless tank, but I don't have a lid on my tank. The water flow is pretty strong so I put something to make the water flow not so fast.
What size of HOB are you using? I think on the EBI even with the top off it might be hard to use a HOB. The foam wall thing is kind of thick and I think water would spash up onto the light bulb.