I don't know how it compares to other builds, but I only have 2 miners and only experienced one blackout without any damage to the hardware. So far so good.
A blackout is 120 volts dropping to zero volts. A surge is 120 volts approaching or exceeding 1000 volts.
A surge protector does nothing - remains inert - until its let-through voltage is exceeded - 330 volts. How does a blackout (zero volts) exceed 330 volts? Obviously a surge protector does nothing for outages.
Outages do not damage hardware. That myth exists because some get emotional (fearful) when a blackout occurs. To hardware, a blackout and a power off are electrically same. Neither cause hardware damage.
An adjacent protector does nothing for that anomaly. And still that near zero joule protector get promoted as if it will cure all anomalies.
Only protector that does effective protection is a 'whole house' one. If any one miner needs that protection, then every household appliance also needs that protection.