It's true that the surge suppressors that use only MOVs or transorb devices are very unlikely to cause problems. Those devices are totally passive until the voltage reaches too high a level, then they kick in and clip the high voltage down.
The more expensive suppressors use not only MOVs and transorbs, they also throw in noise filtering by using inductors. It's the reactance of the inductor that causes the problems I described above. So... the cheaper surge suppressors that don't have filtering are most likely to be best for this application.
But again, remember to over-rate the current capacity of the suppressor, as I mentioned above. If you use too skimpy of a suppressor bar then you might get a voltage drop on the wiring or burn out the On/Off switch contacts. It has to handle the high surge currents without causing a voltage droop.
The current capacity of the bar is not the same rating as the surge current handling rating of the device. So an example would be that the bar can handle 30 amps, but during the surge/spike it can clip off 350 amps. That 350 amps is just for a tenth of a second during the spike. The 30 amps is average current over long term. The spike clipping is normally given as an energy number (such as Watts or Joules), rather than a current handling number, but sometimes they will mention current and people confuse that number with the nominal current handling capacity.
And with a high current device like this, watch out for the ones that have a built in circuit breaker. The breaker can cause a voltage drop during surge demands from normal running of the amplifier. If you use one with a circuit breaker, over-rate it by 3X over requirements.