So, there's a few general ways I might tackle this.

The first is with a radius gauge. something like this set can be printed out. you can then just define the radius appropriately in F360, or whatever software you're using.

Then, in most CAD software- including in F360, you can insert pictures; and scale points on them so you can then build around it. because of optical issues with the camera this is perhaps not as precise as you might expect. However, it will get you close, and then you can print small cross sections of test pieces to verify and adjust.

Finally; the method I usually fall to: Just not caring to be perfect. You don't have to match the cradle perfectly to the contours. you just have to match critical points. take a ruler, find two points that can act as the 'base', and use that as the 'flat' surface, then find a another couple of points that keep it sliding off.

3D-scanning and work with the digital twin.

OpenScan is a opensource project for smaller objects. With the PS5 maybe a Creality CR-Scan but it's quality will be borderline unusable for a shape like a PS5 panel. So after all the entry scanner for a job like this could be a Shining Einstar.

Good news: If you own an iPhone try it's lidar first. Creality CR-Scan is only slightly better than iPhones. With Android phone, you could try photogrammetry but to scan the PS5 part you would need matting spray and even more tracker (small dots glued to the surface).

Btw. Somebody somewhere at some point in time already scanned or modeled the PS5 side panel. As starting point check GrabCAD and thingiverse for a 3D-model.

I would get a CAD model of the PS5, import it into fusion and design the part around it either by extruding to it or using it as a cut tool.

https://grabcad.com/library/playstation-5-3

The PS5 side panels would be modeled using boundary surfaces (or whatever the heck Fusion360 calls them, every CAD software calls it something slightly different). Essentially you need to model the edge shape and then various guide curves across the surface that the CAD software then will fill in with a continuous surface. That said, surface modeling is very much an advanced technique within CAD softwares, don't be surprised if you find it incredibly frustrating to learn.

To do this you are going to need to measure points that will allow you to create the guide curves. The least work would be 3D scanning of some sort that would create a point cloud that you can use to construct the surface, there are some phone based solutions available these days, especially if you have an Apple device. Alternately you can measure it manually, profile/contour gauges are pretty cheap (heck you could probably print one good enough), there are many ways to do it depending on the equipment and expertise you have.

That said, for something like this, I'm doing it the lazy way. A tripod doesn't wobble, design it with some adjustability in the legs to get it fairly level, pop on some rubber feet or double sided tape to keep it in place and move on.

If you have a flatbed scanner, use that to scan the curve (or take a picture if you don't). Import it to fusion, set the dimensions you measured, trace with splines.

You'll have to print some tests I guess, so only print some layers and check the fit before you invest several hours into the final print.