Do not make your problem more complex
As most of you know how hard finding right land surveyor, so does not make the problem becomes more complex. I mean, after you know how hard to find right choice, it is of course you will spend more time, energy and cost when you choose too many considerations for your final choice. Yes, I see how you desire to find best one, but if you do not make limitation for number of surveyor, so how long time you should spend? Besides that, you will be more confused to choose and finally, you do not get final decision.
Now, let you limit the land surveyor number, so you are able to set time for coming to each of surveyor. For example, if you find two up to three best people, not to add your choice is good way, so you can start to find right choice by coming to surveyor one by one.