Instead of having my most used razors on stands on my bathroom counter top I decided to utilize the unused vertical space in my bathroom cupboard.
I found these wall holders on aliexpress which had adjustable arms which you just click in at intervals. I did take note of the measurements and the arms are 3cm long but that included the circle end piece which is a bit thick. This meant DE heads were a couple of mm short of being able to sit flat. However, they're stable enough and behind closed doors I am not worried about them being knocked over. SE heads fit fine obviously.
Now to choose which razors to fill out the remaining 4 spaces.