As with all location requests, you can request that your rooms adjoin, but there are no guarantees. And yes, you can reserve 2 rooms per ent. card and request that they be connecting.
It's just like DM said- we can definitely note the requests, and our Front Desk Staff will do their very best to try to accommodate it for you!
[And by the way, guests getting the ET Rate have exactly the same chance/likelihood of getting their connecting/adjoining requests granted as guests who are paying a full/higher rate! We treat them just the same!