I have no idea for IPTV. I use a streaming box for my own ripped content using Kodi, a Nvidia Shield TV which does Netflix, Prime etc but what you want to stream and channels you have access to are very different from mine.
Also note that your content has to be available in 4K, a 4K box doesn't make everything 4K, the content has to be 4K in the first place.
Please note that if you're going down the route of IPTV discussion that this is primarily a UK based forum, there are a few North American members here but they're in the minority.
Also, the forum does not allow discussion of any apps or content providers that have links to video piracy.
Please note, I'm not accusing you, just new members can get themselves into issues, especially when their first post is regarding this type of topic.