Hard wiring Wifi Extenders

Have you considered buying a second router and setting it up as an access point? You'll still get the significant boost in signal without having to purchase 5+ extenders and if you HAVE to run a hardline to it, you'll only need to run one?

It will depend on the ability to configure those extenders as access points. You will have to check the user's manual to see if they can be configured that way.

A good wifi extender is going to cost between $40-$50. If you're getting 5, that's +$200. For $200, you can buy a Netgear Nighthawk X4S. If that router doesn't cover the space you want covered, you're living in a mansion, in which case you should probably just consider hard lining your connections anyway.

As for dropping speeds, you're going to drop speeds over wireless, period. My desktop gets 500/100 speeds every time, as it's hard lined in. The laptop sitting right next to the router gets 200/40. You WILL drop speed over wireless connection, even if you're buying top of the line routers.

My suggestion with using another router as a wired access point is this: Since the access point will be wired, it will get full, unfettered access to your entire bandwidth. You would place this access point either at the other end of your house where you aren't getting good connection or you would put it as close as you can to the center of the 5 rooms you need to cover, as it would give the most even distribution. Then you would add outlets in all of the rooms that are wired with CATx and give the option for wired connection to get better speeds if you're connecting a streaming device like an Apple TV or Roku.

This is just how I would do it. If the house is already wired, there's no real reason to spend so much money on wireless access points that very well could conflict with each other, not to mention the headache of configuring all of those access points. Not to mention troubleshooting if there are issues with some of the extenders. You're better off spending extra money on one much nicer router and using it that way, then giving the option to wire in to the connection in each of the rooms.

EDIT: I reread your original question after posting and realized that I assumed this was for your home. If this is for another area, like conference halls, it changes the name of the game. If this is for several Large areas, you wouldn't use extenders, you would use full on routers as access points, because routers will offer significantly better coverage over large areas. Just wanted to mention that! Let me know if you have any other questions, or if you want to elaborate on the facility this is being used for.