can i connect roku ultra to router with ethernet cable, and then connect 2 LG smart TVs via wifi
Yes, they're all independent of each other. Most routers can support over 200 devices wired and/or wireless.
yes, my router is quite capable, i just don't know how i can get the 2 tv's connected to the roku ultra device via wifi.
No.
One Roku connects to one TV via an HDMI cable.
If you really want one Roku to be shown on multiple TVs (and for better or worse - to all show the exact same thing at the same time) then you need an HDMI distribution system.
But most prefer one Roku for each TV so everyone is NOT locked together.
ok, i think i get it on the one tv per device. i thought i had read somewhere that the roku device could be connected to router, and tv connected via wifi. it would be easier that way, as i have to pull tv off wall, and fish a cable up behind wall. but if wifi method is not possible, then i'll get to work !
I misread your post at first. I thought you were connecting one Roku device and two Roku TVs but now I think the two TVs are non-Roku models that you wish to have sharing input from your one Roku.
The Roku has only one output which connects to the TV via a direct HDMI cable. It has no provisions for outputting anything via WiFi.
You could run the HDMI output onto a 3-way HDMI splitter and then run separate HDMI cords to all three TVs, but all would receive exactly the same program. Plus these splitters sometimes have problems if the TVs don't all support the same resolutions.
Generally it's both easier and better for each TV to be connected to its own streaming device.