What I’ve seen in a few jobs is that the employer chooses a provider and plan. This might change from year to year.
They pay for it, and the premium is added to your gross income so you pay BIK tax on the amount.
You get a tax credit against it too.
Depending on the employer, and how they manage payroll/HR, they may allow flexibility to change plan and provider, but this is extra administration, so it may not be widespread.
Don’t know how typical, but we are on
https://www.layahealthcare.ie/productsandservices/plan/scheme/principle
There’s normally a group discount I think, so getting a plan through work is likely to be less hassle and better value.