Roku, AppleTV, Amazon Fire, NowTV etc are "locked-down" and only support apps from official channels and partners. Think of Netflix, BBC iPlayer, Amazon Prime Video, etc. We certainly do not fall under this sort of category!
Android is different, much more "open" for people to do as they wish with.
We recommend boxes based on Android such as the Formuler Z8. It is highly compatible with our channels, it supports recordings (both live and programmed via the EPG), timeshift (pause & rewind live TV) and more.
There is a list of Formuler boxes on this page. https://www.formuler.tv/ all of the Z models will be compatible, also the S models which also include satellite connection if you use satellite TV.
We highly recommend the Formuler Z8
We are not affiliated with Formuler, it is just by far the best box!) it is the easiest to use and has the best features and is still being actively developed and improved by the manufacturer.
If you cannot afford a brand new Formuler Z8, maybe consider a used box on ebay, confirmed working well are Formuler Z7+, Formuler Z7, or a Dreamlink Dlite (all of these support timeshift and recording) but as mentioned the best to get by far is the Z8 (there are a couple of niggle annoyances I have found with the other models mentioned here.)
Failing that, you could consider a cheap Android TV box, then use an app called STBEmu. While this does not offer recording or timeshift, it does allow you to use the remote control to view the TV Guide, change channels and so forth. A lot easier to sit back, relax and watch TV and not have to navigate via a web browser,