What is Reddit's opinion of Kantek Mobile CPU Stand with Adjustable Width and Locking Casters, 16-Inch Wide x 7-Inch Deep x 4.8-Inch High (CS200B),Black?

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Ideally you'll want at least 2-3 inches of clearance off the ground for the sake of your PSU and 4-6 for every other side that has any sort of air flow just to make sure the air can travel properly. What I did was got a CPU stand like this one and put a plastic mat under it (like the kind you use for wheeled office chairs) to ease getting it out from under my desk for periodic cleaning/dusting.

I just glide mine across the carpet and my other spare gaming pc is laying under my bed on carpet. I did find me a free mobile stand though something like this.
Another in wood cabinet to slide off of.

I have mine on one of these raised off the floor.

https://www.amazon.com.au/dp/B001AJS3BS/ref=cm_sw_r_cp_apa_glt_fabc_7YVC82MXKA3NSC1HZEE5?_encoding=UTF8&psc=1

https://www.amazon.com/Kantek-Adjustable-Locking-Casters-CS200B/dp/B001AJS3BS/ref=pd_aw_lpo_229_lp_img_2/134-3499998-6618142?_encoding=UTF8&psc=1&refRID=7Y0WF1YTT0GBQA4AVA8R

I've had it for so long I'm surprised I found a link but here it is!

I was thinking of getting something like this

https://www.amazon.com/dp/B001AJS3BS/ref=cm_sw_r_cp_api_HNjPxbW26W4YZ

You think that will do?

There are wheels made just for computer cases. I know you are in the UK but here's a link on amazon usa with some listings https://www.amazon.com/Kantek-CS200B-Mobile-Stand-CPU/dp/B001AJS3BS

I bought a mobile stand that's working out pretty well. That being said it does tend to tip just a bit if you push at the top of the case.