I haven't looked at the specs of the woofer, but if you tune the enclosure low enough and don't crazy amounts of power at it, you won't have a problem with it bottoming out. Check out this document on vented enclosures from Adire Audio on the Shiva.
https://www.polkaudio.com/forums/att...4&d=1131452352
This has some cool info on tuning the woofer down to 18hz. With a tuning that low you won't run into any bottoming out. But this will be different with the RE XX.
Download WinISD and play with it.
http://www.linearteam.dk/default.aspx?pageid=winisdpro
Great software. It hasn't been updated in 10 years but works great. You can put the input power and the enclosure you design and will tell you how much xmax there is at each frequency. You can use it to see if you in the range of bottoming out the woofer.
Here is some example of graphs you can get our of WinISD.
http://fluxaudiolabs.com/FAL%20B10-4...%20Example.pdf