You can combine this:
https://x-naut.com/collections/aviation/products/pilot-series-ipad-mini-cooling-case
With any RAM mount components you want:
https://www.rammount.com/shop-all/airplane/components
To achieve the desired configuration.
Let me know if you need any 3D-printed adapters, but it looks like that holder is plug-n-p(l)ay with RAM joins.
I have decided to install a mount for my Ipad Mini 5 in the TB20.
It can be done if there is nobody in the RHS, or if it is sitting fairly high so it clears their legs. It can go here
and the mount will itself be quick-release so it can be removed if flying with a RHS passenger.
The mount must be fan cooled. As per various reports – example – the Ipad shuts down very easily due to overheating, in the TB20 which has large windows. So I will connect external power to it; it will sit close to the powered Lemo headset sockets which is handy. I will also need to plug in a USB cable to the Ipad to keep it charged; I can build a 28V→5V charger which goes on the back of the mount.
The sort of thing I am looking at is here but the Ipad needs to be quickly removable.
Can anyone recommend something known-good?
Multiple identical Ipad mount threads merged 
I use a combination of RAM Mount parts which looks a lot like Peter_G’s setup.
@Peter_G it looks very nicely engineered so I expect will select this option!
greg_mp wrote:
The problems starts when you start playing with the yoke with good roll amplitude, the tablet landscape/protrait switch algorithm doesn’t really like it.
This can be disabled by either a physical switch on older models or from the ‘Control Center’ (swipe down from top right) in newer models.
Ooops, @Denopa beat me to it
I’ve used this https://www.scosche.com/extra-large-magnetic-mount-for-tablets-and-other-devices on my yoke, works great, is quite discrete and holds up to an iPad Pro without issue.
Re: orientation changing when you turn the yoke, at least on iPads you can lock that.
greg_mp wrote:
On the C172, I can mount the craddle on the left side of the windshield, and with a short arm you can mount an 8’ tablet without restricting view of yoke movement.
On a 172R, we have a permanent mount on the right side of the panel. It is of course much easier with the larger panel of a C172 compared to the PA28.
