Nano rings are ideal for someone with really thin hair. Always remember nano rings need to be rotated every 6 weeks ie: install a row, miss a row. After six weeks move rows upwards. This only applies to nano rings because the section you are attaching to is very small. This method can be applied a lot higher up to clients parting as the extensions are not visible.
https://www.youtube.com/watch?v=nRdTJSQ1GW8
This method takes much long to install than other methods because of the very small sections.