Salary For Senior PLC Programmer / Automation Engineer

Your take home will be less that 3000/month. 3 of You can survive on this, but you r not going to save anything. For salaries use Glassdoor.com

Thanks and you are correct, it is less that 3K a month. If we can't survive the wife have to start working

Just another question as I don't want to start a new threat. I would leave it here for a couple of days to see if somebody answers.

When I apply for the blue card, I know the process takes up to 90 days.
When do I submit my passport? At the start or only at the end when my application is successfull?

My employer told me I would not qualify for BlueCard because my work-title is not senior director or VP level. Allegedly in Belgium you have to have salary over median BEL pay-rate as well as specific title indicating that you are executive or hi level manager. Individual contributors never get such titles....
But most importantly, if I were you I would double check about your wife status, as I am 90% certain she will not be allowed to work legally anywhere in EU even if you receive your BlueCard or Work Visa.