My husband and I work in the same research area (of theoretical computer science). We were in the same PhD program and even had the same advisor. We are a great collaboration team, and really enjoy and are productive when we work together. In addition, neither of us have anyone else to collaborate with because no one in the department really works in quite the same area (not even our advisor - long story). As a result, nearly all of my papers are co-authored with my husband. My husband has a decent number of papers without me as a co-author because he is three years ahead of me in the program, so he has his papers from before I even started, and also has had more time for more papers since I have just completed the class-heavy portion of my PhD.
My husband has recently graduated and is a tenure-track professor at a good university. I would also like to be a professor one day. From what I've seen in my field, spousal hiring seems pretty common. So we figured that we would both apply to a bunch of universities and would end up being hired as a pair. However, we have been worried that us both being in the same research area and publishing together is going to cause difficulties being hired. Since I have a few more years left in the program, my plan is to to have two or three good publications that don't include my husband (I already have one single author paper in a good place).
So my question is, how difficult will it be for us to be hired together into the same department if we have so many papers co-authored together? Will publishing a few good papers without my husband improve the situation to the point that we have a reasonable chance of being hired together, even though a significant amount of my early work was with my husband?
Additional Note: Even just in my department, several of the new hires in the last 3 or 4 years have been husband and wife pairs where they were both hired into the computer science department. So it seems that this practice is currently very common in CS. I have not seen any that shared a research area, though.
Edit: This question is very different from the one asked at PhD Student : Publish Paper with Wife? . That question is primarily about whether it is strange to publish with a spouse at all (and the spouse in question is not in academia), while my question is specifically about my husband and I getting hired together in the same department if we have co-authored a significant amount of our work together. The answers provided there don't really help with this question.
Edit: I have edited down the four questions to just a single main question.