Yes, they are. Every Republican is in favour of it as the best of a bad lot and the moderate Unionists are in favour as it preserves the (more) peaceful status quo and the all island economy that's developed over the last 20 years. You want a moderate unionist view talk to
@AlexWilliamsGloves about it. They want as little change as possible to their lives. Putting a border in the Irish Sea effects very few, mostly those in import and export, who are all in favour of it as they don't want their supply chains disrupted and checks already happen between Ireland (all of it) and Britain. They'll have a bit more paperwork and that's it, there's already a geographical border, there's already shared territory, there's already regulatory differences between NI and Britain, there's already passport checks between NI and Britain. The only difference with the NI only version of the backstop is that the signs at airports and seaports that read EU Citizens and International would read CTA Citizens and International on your side and EU/UK Citizens and International on ours.
Then you have the human and economic cost of a 500 mile land border in rural Ireland.
Think about it.
In fact, since this is so important to you, visit, drive the border roads, speak to the people there.