In fact the Prophet Muhammad SAW did not use a prayer mat and instead he placed his head on the soil (ground/earth).
Also note; Shias place their head on a stone/rock to mimic this practice: https://en.m.wikipedia.org/wiki/Turbah
Please know that Zikr (remembering/repeating one of the many Names of God) is the highest form of worship. (Zikr is commanded three times in the Quran-i-Kerim.)
Al-lah, Yah-weh, Di-os, De-us, Brah-man, ...
Many Names in our various languages for the one Creator, one human race, one religion of God: compassionate service to all mankind that comes in many forms across our planet's cultures and epochs.
Always love. Teach to always love. Never hate. Teach to never hate.