How to use 都 and 也 together？
It's not a good practice to put 也 and 都 together. 

我们俩也都觉得你喜欢她 might be ok, but 我们俩也觉得你喜欢她 or 我们俩都觉得你喜欢她 sounds more natural. 

我们俩也觉得你喜欢她 and 我们俩都觉得你喜欢她 have slightly different meanings. 我们俩也觉得你喜欢她 implies that there are someone else already thinking you like her and we also think so. 我们俩都觉得你喜欢她 just means both of us think you like her.