Adding two EX7300v2 as Extenders to an Ex7300v2 Access Point

Can you? Probably. 

should you? probably not. 

A standard single/dual band extender drops throughput by 50%. this happens because it has to use the same chip to go router----extender and then extender----devices and it can't do both at once. And thats 50% of what it recieves. Because of distance/interference/obstructions, its probably starting off at much less than 100% of the routers speed. 

And thats for the first extender. Add another one daisy chained and it takes that same hit but based off the signal its getting from the extender and not from the router. So its speeds are more than likey much less than 25% of what the router is putting out. 

the triband extenders/mesh systems have a dedicated wireless channel just to help avoid that. 

I usually advise those wanting more than 1 extender, to make sure you set them up in a star configuration. 

Star: extender<-------router------>extender

Not daisy chained

Daisy: router------->extender------>extender

It can also create issues when using more than 1 extender because they connect to the ssid and if its the same from the router and extenders, it can create issues. Another reason I usually recommend moving to an actual mesh system like orbi if you're needing more than 1 extender.