I am a big openrent fan. If you live in a naice area with naice estate agents i'm sure you'd have a different experience but round my way most agents simply do not care who lives in your property, the first couple / family vaguely fitting the brief who pass the credit check will get your house so they can get the lease signed and the commission banked.
Remember that an EA isn't responsible for the tenant paying the rent, or for the eviction. They'll chase for unpaid rent in a legally compliant way, leaving the correct paper trail, but if they still don't pay the matter will quickly be passed to the insurers (either theirs, if you took out their rent g'tee insurance, or your own).
An EA will not guide you through the court process and hold your hand they will direct you to the appointed case handler at the relevant solicitor's firm.
I genuinely sleep better at night knowing and having vetted my tenants personally. They have all of our contact details and there is nothing we haven't been able to resolve quickly and satisfactorily for them, even from overseas.
Tips on using Open Rent:
Don't give your telephone number in the ad. Make the interested parties communicate in writing.
The applicants who wrote a blurb about themselves / their personal situation (who, what working as) and politely enquired when they might view went to the top of my list - we were inundated.
No one was allowed to view until they had acknowledged / confirmed they understood the credit check requirements and earnt enough to pass the check.
Everyone else (who just said 'when can I view') was asked to please write a little about themselves / their household and what they were looking for / why moving.
Anyone who said 'we'll take it' or 'call me 07xxxxxxxxx' didn't get a response.
This will sound counterintuitive but if you want max 2 people sharing don't write that in the advert. It encourages fibs (ie subletting). People are astonishingly honest about who will be living in the property if you don't make your red lines transparent!