I'm having trouble finding an android tv app which would allow me to record a show that airs daily.
I tried progTV and IPTV Extreme Pro, and can see where they both allow recording. However, I'd have to set up a schedule for each day I want to record.
Are there any apps out there which could support something like record channel X every week day from 4pm to 5pm?
Why not get a provider that has the catch up feature, than you won't need to record. Usually they have 7 days or more worth. Unless your wanting an actual copy. Your best would be a buzz xpl or a dreamlink box as both of their native IPTV apps allow recording. They are apps specific to those boxes and are not installable on any box.
I use Emby just for the DVR feature you can put your m3u in there and you can record multiple programs at the same time to an external SD. It cost $5 a month for the premier subscription but its worth it. You can even set recordings from your phone from outside of your local network.
I use nextpvr on my PC to do the scheduled recordings then access it with nextpvr Android app or Kodi via my Nvidia Shields.