You do not need an anti static mat or wrist strap.
Do i need an antistatic mat to build a pc.
Do i really need an anti static work mat.
Just plug the pc in an outlet and connect the wrist strap to the pc case.
Electrical outlets are normally the best ground for a mat in any building.
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I am a field tech and have never carried around a mat or strap.
Since carbon is conductive if the mat is laid on top of conducting tables and floors static will travel through the mat into the table and dissipate at the floor into the ground.
However typically you will want to connect an anti static mat for pc building to an electrical outlet.
That is why i always use a wrist strap and wear cotton clothing when working on hardware.
Just take the other necessary precautions.
Instead of using a wrist strap connect the chassis to earth ground roll up your sleeves to maintain contact with the chassis exposed metal.
It is best to have it plugged up and unplug the power connector off the motherboard.
If i handle a bare mainboard i use an esd mat too but when i just add components into an existing pc there is no point in using a mat.