I am using 5.8 GHz link PTP solution between 2 location 10 km apart
5.8 spectrum is unlicensed spectrum.
The antennas are installed about 30 m AGL.
The beamwdith is around 10 degrees.
Is there any possibility of interferecne from any wifi source (given the antennas are higher up AGL)?
Of course, because it's unlicensed spectrum, there is always the potential for interference. However, it is very unlikely given the height of the radios.
You can put one end up, and run the spectral analysis tool in the radio (before installing the other end if you choose). This would give you confidence in the spectrum and even help you select the best channel to use.