I would suggest using good TVSS equipment at the main service [not just the simple MOV things!], discharge device[s] at the CATV and the Telco's MPOE [for POTS] for the "Bad Surges", then use local supression at the Equipment to complete the package.
Local TVSS would be a Quality TVSS Plug Strip for AC Power at the Equipment, plus quality TVSS for the POTS [Phone line] and / or CATV at the Equipment.
As suggested by another member, make sure these TVSS items for the phone and / or CATV system[s] do not end up interfering with the service it's self.
If you need some info on this, let me [or us] know.
As to local AC TVSS items, I kind of lean towards plug strips with quality functions [filters and TVSS]. This is so when the protection fails, it can be replaced easier and is more noticable. Also result in having [somewhat] ample receptacles for things right at the TVSS protection, rather than from another plug strip.
I do not use the "Combo Power / Telephone TVSS Strips". Instead, the POTS TVSS protection is a separate unit.
A few suggestions to check prior to getting any POTS TVSS items would be to:
[*]Check the On-Hook DC Voltage over a period of time,
[*]Check for an Off-Hook AC and DC Voltage level - with dial tone, with no sound and with normal conversation,
[*]Verify the Loop Current's level.
This can be plotted against levels when protection is connected, to verify proper and ample levels.