Geostationary moon

My planet is very Earth-like with a day length of 26.87h. The moon has a radius of about 1550km, a mass of $5.2\times10^{22}$ kg and orbit 45500 km from the center of planet.

My scenario is that the formation of this moon is the same as our Moon (i.e. from a collision) but that the planet was spinning slower so they would be both totally locked to each other, thus the moon wouldn't slow down and move away, staying in a geostationary orbit.

Is this realistic? Would it have an effect on plate tectonics, and what other effect on the shape of my planet would it have?

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Geostationary moon

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