Very common odds are it will not be an issue.
The PCB isn't sturdy enough to keep a straight line with the weight and lack of rear support, the heatsink design and lack of backplate also puts all the stress against the pcb, allowing it to bend like such.
Think about it this way, take a piece of paper and hold it the long way away from your hand, you will easily notice the paper bends down at the other end, it's own weight is too much for it to handle, now go ahead and tape a piece of cardboard full length from one end to the other, problem gone. Why? Because the cardboard is sturdy enough to support it's own weight.
If it's a concern you can pretty easily get sheets or sticks of ABS and build yourself a support bracket with very basic tools.
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