1. Since Hyper 212 plus is 2.6mm lower than V8 which can fit into the CM690 as shown in the picture, the 212 will definitely fit into the CM690.
2. As you can see in the picture, the Corsair PSU's fan is placed down. Besides, I place my PSU's fan down as well in my HAF922 case which has a PSU ventilation hole significantly lower than that of the CM690. Thus, you shouldn't have any trouble in placing the PSU fan down.
Good luck on your new build!