Rock Pi S for TDOA


I want to make an indoor positioning system with TDOA algorithms. The idea is to use 4 stations that are connected to a Wi-Fi network. These stations or nodes must send an RF signal to a device, which will receive that signal and respond. The response signal of the device has to be captured by the 4 nodes that must be synchronized in their internal clock frequencies, since the algorithm calculates the time difference of that signal to each node. The propagation time of the signal at these distances is in the order of 8 nanoseconds, do you think that the rock pi is capable of calculating this time?
Do you know how I could perform the synchronization of the 4 devices?
I appreciate any kind of help with the topic of synchronization and which hardware to choose for these nodes.