The 120mm EK rad in the bottom may be challenging, but hopefully you can get it. I'll echo
@MarcParis and say if it doesn't work, try the XSPC TX120 there instead. For the top rad, I believe the HW Labs Stealth L-Series (you can get it on Performance-PC) will fit, but not the big HWLabs Nemesis GTS as its too long and too wide. Hopefully the EK 280 fits in the top but be aware that if the corners are too square you may have issues with closing the side panels due to the ball studs hitting the rad. You can mount fans on top and then rad underneath it to hopefully work around that if necessary.
If it's at all possible to make it fit, have the pump at the bottom with the reservoir above it. You always want the pump at the bottom of the loop to keep it from running dry. Can you swap the position of the res and the pump? Another person mounted the DDC pump in the bottom instead of a 2nd radiator. I've also seen folks mount the pump where you did by screwing directly into the case, but they used the radiator above it as the "reservoir" by filling it using top-facing fill ports (such as in the Nexxxos Alphacool rads).
Is that the Aorus Waterforce card that uses a built-in EK water block? If so, find out from EK (their email support is great) if you can use the
90 degree rotary terminal on the top, it will help with your tube routing significantly.
Good luck and keep us posted!