a few probably long shot router questions?

goshawk on horseback

hello all,
probably asking a few long shot questions about a couple of routers, but so far, I can't seem to find the required info, so nothing ventured, nothing gained.
1. does anyone happen to know, if the external antennas on either the Linksys EA9500 Max-Stream, or the TP-LINK Archer C5400 routers are fixed or detachable?
2. if either happen to be detachable, does anyone happen to know what connections they use?
3. finally, does anyone happen to know if either of these routers would have the transmission power to support a full set of 15dBi gain antennas?

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