People do this many different ways, and there are a number of existing threads with project reports that might give you some ideas.
The following was started along time ago, but the wall mount ideas are still relevant and there are a lot of different ones, some very creative. Ignore all the stuff about code, just look for the posts with pictures of mounting options and you’ll see a lot of variety.
( The topic title is a clickable link)
There are some additional project reports under the following topics. Some of the newer ones have plans for 3-D printed frames, others are more traditional.
Personally, I use a combination of picture frames and Sugru. Sugru is a moldable rubber adhesive. When you first open the package there’s a piece about the size of 3 US quarter coins. Play-Doh consistency. You can stretch it and mold it by hand. You stick it in place and give it about 24 hours to dry and it will end up feeling like rubber. Works very well. Cost about three dollars a pack, a little less in multi packs.
If you want to hide the cables, combine it with a picture frame and the usual Cable raceway. raceway is The generic name for a plastic tube that goes over the cable just to make it look nicer. You can find this at places like Home Depot or OfficeMax or sometimes Best Buy. Or of course online. There are many different brands, sizes, and colors. People use them for home theater set ups, alarm panels, etc.