Range Extenders

If they're mesh, I highly recommend disabling the mesh on one of them so either one of the extenders or the router has a different SSID (name). They tend to be less stable when you're using 2 mesh extenders together because if theres any instability in the primary network, they can end up connecting to each other. They can also end up connecting in a daisy chain which significantly increases latency and decreases speed. 

So can it be done? yes. 

You'll just need to be cautious with setup to ensure its stable

Yes, any number of WiFi extenders can be connected to a WiFi router.  Typically, the extender should be close enough to the router to get a good signal and also close enough to the device being connected to provide a good signal.  Often "half way" is a good compromise, depending on the building construction.

 

An important consideration is how the target device expects to connect.

• If the goal is to provide an Ethernet connection, then obviously the WiFi extender needs to be in the same room as the device.
• If the goal is to "extend" the WiFi coverage, then I would start with about "half way" and see how it goes.

People often have a choice of having the WiFi extender broadcast the same WiFi credentials as the primary router or defining a different WiFi network name.  This is often useful in preventing the target device from attempting to connect to the primary router rather than the extender.