[allikat]

Surge protection is useful, but you do need to cover all the possible avenues for it to affect your machine to be anywhere near safe.
In an ideal world, you'd run your machine, displays, accessories, and router on one protected strip which you replace regularly (as MOVs degrade every time they stop a surge). You would also have another MOV to protect the phone line and prevent surges coming down the phone cables into the router and killing your machine that way.