A few more points to consider.
Is there good access into the ceiling at each location? The fans will likely require battens or brackets installed for the fans to mount to. Unless you have a very old house with solid veejay timber ceilings or similar.
Fans with speed controls at the light switch will also require extra wiring to power the fan separately to the light. Sometimes pulling in the extra cable can be quite difficult. There are options with some products to have a fan that uses a wireless remote control that saves the extra cable. Note many ceiling light fittings may not have an earth connection (required for fans). This is also an extra length of cable when required, typically from a suitable connection somewhere in the roof space.
One strategy may be to arrange for your preferred local electrician to come and look at the job to provide some advice or recommendations, before you go out to buy the fans you would like. Noted your comments
The more you can tell them about the job reliably the more likely they will respond. Alternately flying blind is a bit of a risk. Offering to pay an electrician a small agreed cost to look at the job, one who is local and preferably one who you get a mates reference from might be the go. Simply ask them to come and inspect the job and advise what is required. They should also be able to subsequently give you a firm quote or maximum estimate for the job. Your call then as to how many other quotes you get, but at least you have a starting point. Also no need for you to crawl around the roof or show off your lack of electrical knowledge.
The electricians we use will inspect and quote or estimate at no cost, but only as they know the house. There is much value in asking those you know locally who they have had great service and fair costs from?
The ceiling rose suggests an old house. These, unless it is our 140 year old cottage which has been rewired recently are full of expensive surprises. It would seem a pity to ruin an older style ceiling and rose with a fan light. We use modern produced, older style pedestal, fans in two rooms with 3.3m ceilings. In another larger room pairs of ceiling fans no lights, mounted in diagonally opposite corners work great.
We purchased ceiling fans that have long 1.2m extension shafts available at extra cost. Ceiling fans in short shafts look all wrong to my eye on high ceilings. Installing the fans closer to the middle of the air space seems to work better (more circulation), subjective comparison with other rooms with fans installed close to the ceiling.