The Prusa MINI's connections to the heatbed are by default at the bottom of the heatbed (last picture), but the copper contactpatches are at the top. From electrical standpoint, that doesn't add up.
Prusa claims that this is no issue which I'm not questioning at all. It just looks more efficient to me that the contactpatch is as large as possible to reduce the resistance to a MINImum (pun intended).

I've found a design by lennert vd kort which addresses this issue. Since it did not have any cable relief, I've added one in this remix. You can secure it with a optional zip tie and hide the head at the bottom.
I also added 1 extra mm of height to the top part to accommodate an (optional) extra washer on the top. So far as I can see, there is no danger of hitting anything.

How to print

Material: PETG is recommended (temperature resistance).
- I used Prusament Prusa Orange PETG
Layer height: 0.20mm
Perimeters: 2
Infill: 15% gyroid
Supports:
- Bottom part: from baseplate only/enforcers only
  - Snug supports are preferred.
  - I've added manual supports on the ins and outs, but might even work without any of them.
- Top part: no supports needed

Assembly

The screw holes on the top part are closed for printing purposes so that there is no need for supports. Use a screwdriver to punch threw those holes when assembling everything together.

Since there are 2 more holes now than the original part, you'll need some extra parts:

2 x M3 10mm screw
2 or 4 x M3 washers (above each clamp and/or below the heatbed)
2 x M3 nut

You can follow the assembly guide of the MK3 from step 3. Assemble everything before trying to mount it to the plate so you know that all the screws grab properly.
I've assembled everything in this order: