You've read a few problems reported in here where people come to post problems and seek answers.
What you don't have is information from the many of hundreds, thousands, ... who have no issues.
You will have your own experience but to give yourself the best chance, connect both TiVo and V6 to your home network by direct Ethernet cable, failing that by powerline adapters, failing that by wifi (not available for TiVo).
Good luck and enjoy.
You have arranged to keep the TiVo, pay the monthly charge for it and have a co-ax connection point for it?