Aftermarket spoiler and installation questions

I have always liked the look of the OEM spoiler, so I want to add one to my '05 SR5. I found one that is already primed and painted in my factory color (8R3) for $305 shipped.
Has anyone here already done this and, if so, was it difficult? What is your opinion of the one I found (link attached)?
While examining where the spoiler will be attached, I found these two plastic punchout covers. After drilling the attachment holes from the exterior, is this where you attached the screws for the spoiler, then cover them with protective silicone, and then reattach the covers? I'm hoping it is that simple!

https://www.carid.com/cart.php

 

Mine came with an aftermarket wing that is more stream line, it was half-ass installed so I did my best to clean it up. Fits a little better but I believe the factory spoiler would fit perfect. I will ride this one out until I cannot find replacement led 3rd brake lights then I will re-visit replacing it with a factory spoiler.