Since Florida is the lightning capital, I've added multiple surge protectors in my home to cover Internet and power lines. For my Legend system, I'm currently using the Lucent Sneak Current Protection unit (507B sneak protector) for analog lines (up to 25 lines). I've noticed some systems use the Lucent 146C (4 lines) for protection. Is there a difference other than the line capacity? Is one better than the other? Thanks for the advice! Jim