Power strip cord length
A extension cord is the obvious simple answer.

In case you actually have a legitimate aversion to a extension cord in this application (hard to imagine), you'll either have to find a power strip with a long cord or lengthen a existing one yourself.  Power strips with long cords seem to be rare, probably because many consumers by on price and they can be cheaper with short cords, and people can add their own extension cord.

Lengthening a cord is fairly simple if you know how to solder and make everything safe afterwards.  However, if you have to ask here how to do that, then you shouldn't do that.  The safety and fire risks are such that if aren't sure you know how to do this, get someone that is sure to do it or use a extension cord.  I'm not going to go into the details here because this is the kind of thing not appropriate to learn from the other end of the internet.  Learn from someone that actually knows how to do it properly.

Even if you did a good job of lengthening the cord, it likely won't be legally acceptable or it can be used as a excuse by the insurance company not to pay if the building burns down.