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Can a tank hold 3 HOB filters?

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I have already two in my 29G (4mm glass). 2 Fluval C3.
Quick question - can the tank hold 3 HOB? Like 2 Fluval C3 and 1 C4? Or 3 C3?
They won't broke the glass by putting too much weight?

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The water inside the tank is putting more outward pressure on the glass than those filters ever could. The filters sit on the top of the glass and exert the majority of their force downward, so I'd say you'll be fine. Have you considered a canister filter instead?
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