Reddit reviews Tryone Tablet Headrest Mount - Black

https://www.amazon.co.uk/Tryone-Gooseneck-Nintendo-Samsung-Overall/dp/B01EMMKI4O/ For the UK and Ireland.

Not exactly the same, but something like this does a very similar job and works great (that's the one I bought). Fixes firmly to anything within a certain width.

https://www.amazon.co.uk/gp/product/B01EMMKI4O/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

This holder works perfectly. The neck is sturdy enough that you don't have to worry about it drooping over time and I've not once been worried it was going to fall out of the clip. The neck is also loooong so, no matter how you lay, you can get it in the perfect position. I've been using it for about 8 months.

Weirdly this...

Tryone Gooseneck Tablet Stand

https://www.amazon.co.uk/dp/B01EMMKI4O/ref=cm_sw_r_cp_api_oTj8BbQTGNCWG

I didn't actually mean it to be a camera stand - I bought it for the kids to make videos with their iPads

But it's since been retasked :D

Not when I'm out and about but usually before I sleep I end playing zelda for a few hours and my hands get numb, so I bought this -
https://www.amazon.co.uk/gp/product/B01EMMKI4O/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

Just throwing it out thet but would you possibly have somewhere to attach a goose neck? I used to play with the Switch on my belly till I came across this and haven't looked back :)

https://www.amazon.co.uk/Tryone-Gooseneck-Nintendo-Samsung-Overall/dp/B01EMMKI4O/ref=mp_s_a_1_1?ie=UTF8&qid=1549058598&sr=8-1-spons&pi=AC_SX236_SY340_QL65&keywords=tyrone+gooseneck+tablet+stand&psc=1

I highly recommend purchasing one of these:

https://www.amazon.co.uk/Tryone-Gooseneck-Nintendo-Samsung-Overall/dp/B01EMMKI4O

It allows me to play my switch with my pro controller in the perfect position while in bed.