How to access all cameras on one screen?

My daughter is  having domestic issues we got her Roku cameras to ensure her safety. To only find out we both can't access them unless on same account. That means a total tv reset. I have access through the app on my phone & pc but you cant watch all the cameras at one time on the phone or keep both moniting her home. Bottom line I want to have access to all cameras on one screen to make sure she and my grandkids are safe and have 24 hr recording. A system is no good if you can't watch to make sure your secure.