Okay, so by "Roku device" you mean I'll have to buy the Roku Express+ for each TV?
I hope that's what you meant and not that I would have to buy any special device to go along with the Roku Express+.
Yes by Roku device, I meant a Roku streaming device, not some other equipment. Each Roku delivers its signal to the TV by an HDMI connection. It only has a single HDMI output so typically each TV would need its own Roku. It's possible to run this output into an HDMI splitter and then run separate HDMI cables to more than one TV, but all would receive the same channel feed and could not watch separate program choices, plus the splitters are often problematic and may cost as much or more than a new Roku.
The current line of Rokus includes more models than just the Express+. If the TVs you wish to use with the Rokus are 4K, or you think you will be upgrading to 4K in the future, note that Express and Express+ are HD, not 4K. The next step up, the Roku Premiere, does support 4K, as do all the other "higher" models. Feature comparison of current models: https://www.roku.com/products/compare
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X