Fred Farnsworth

It is perfectly all right to collaborate with numerous recruiters. I tell every candidate that is dealing with several recruiters to do the following:

Be straightforward and let the recruiter know that this relationship with them is not an exclusive.
Be specific with your recruiter and let them know where your cv has been sent out by either yourself or an additional recruiter and demand that they let you have knowledge of, in advance, where your resume will be sent out.
There is absolutely nothing worse than a hiring manager receiving your resume from multiple sources. It raises a red flag. I have actually learnt through companies that they typically remove that resume due to the fact that it’s challenging to figure out who exactly is really representing the applicant.

I actually do feel that 1-3 recruiters is a good arrangement for a job search. Begin with one, talk with them, and see what they have to offer. Just how they would deal with aiding your job search.
Stick with them if you like them and they have a good amount of options. If their options are limited, talk to an additional recruiter. Make sure you have choices and know what you want. Again, if you feel one recruiter has everything covered for you, fantastic! You can feel in control of your job search. I personally feel that the more recruiters that are working with you the amount of control that you give up can really come back to harm you in the long run … it would be a real pity if you were best person for an opportunity only to have it not work out because of something out of your control.