The anti sag brick looks nice but is restricting airflow from the side, if you can look for a stand for the corner of the GPU.
You don’t have to populate all available fan slots. I would recommend you to remove the bottom one entirely, even if your PC is on top of a table and dust isn’t a problem, this fan redirects a lot of the air, coming from the front 2, slightly up to the CPU.
The problem with the top one is, even if you rotate it to be an intake, it could push the air, coming from the front, down away from the CPU flow.
Short: try and simply remove the bottom and the top front one entirely.
Like someone already stated, you want the air to move linearly from one side to another.
I don’t recommend to use air guides since they can create pressure points and block other components. Components like RAM, VRMs and drives also need some fresh air.
The anti sag brick looks nice but is restricting airflow from the side, if you can look for a stand for the corner of the GPU.
You don’t have to populate all available fan slots. I would recommend you to remove the bottom one entirely, even if your PC is on top of a table and dust isn’t a problem, this fan redirects a lot of the air, coming from the front 2, slightly up to the CPU.
The problem with the top one is, even if you rotate it to be an intake, it could push the air, coming from the front, down away from the CPU flow.
Short: try and simply remove the bottom and the top front one entirely.
Like someone already stated, you want the air to move linearly from one side to another.
I don’t recommend to use air guides since they can create pressure points and block other components. Components like RAM, VRMs and drives also need some fresh air.