Bellablue,
I think Velop could possibly be your answer in getting the adequate coverage you need in your home. I previously had Spectrum and Velop integrated fine with their modem. Basically, you plug the main node into your provided modem from Spectrum and the accompanying 2 nodes you place them throughout your home where you may experience lag, dead spots, buffering, etc... The cool thing as you place the nodes throughout your home, the downloaded app (required) is going to let you know if you've placed it in a place where the signals can communicate well. Yes, you can use iPads, phones, computers, printers, scanners, smart locks, gaming devices, etc whatever needed and Velop can handle it and provide you with robust coverage.
Lastly, Linksys has this product in various packages from single to triple nodes; so, you get to choose what is needed based on the square footage of your home. I hope this info helps some!