Any recommendation that also does not say why with numbers is often a myth or scam.

If using a 240 volt power source, then all cables must already be rated for that voltage.

What does a protector do?  Protector can make damage easier if located adjacent to a miner.  Protectors that are effective never do protection.  Those proven devices only connect a surge to something completely different that does protection - single point earth ground.  Protection is where hundreds of thousands of joules are harmlessly absorbed.

Best protector for all 120 and 240 volt appliances is located at a service entrance with a low impedance (ie less than 10 foot) connection to earth.  If even one miner needs that protection, then everything in a house needs that protection.  With numbers that even define protection from direct lightning strikes.  A protector is only as effective as its earth ground (which obviously is not a wall receptacle safety ground).  And typically costs about $1 per protected appliance.