Download Tivimate and Serverless Bluetooth Keyboard & Mouse for PC/Phone. Then install as many m3u url playlists as you want. The phone mouse works perfectly with the Fire HD Tablet and Tivimate. I pd for the premium ($4.50), but it’s not necessary. The remote app lets you have total control of all the Tivimate features. Once you have Tivimate set up the way you want, you can watch all your channels without using the remote, but you will need the remote to access your VOD TV and Movies sections.
All-in-all, because of Jayhawks find, imho, Tivimate is the way to go.
Serverless Bluetooth Keyboard & Mouse for PC/Phone - Apps on Google Play
From your tablet using a file explorer (I use X-Plore) you can either download the TP list or enter the m3u urls manually.
Tivimate has a lot of options and features to enable you to tweak the settings to your liking.
Credit Jayhawks659 for finding the phone remote. That made it a game changer for me!
Here is another link for some more url options; Updated 11/16/2021: Adding Pluto TV and other URL's to Tivimate