Hello,
I can do this as I did it before. You don't need any specific tool, you just need to hire someone to do this job, and I can do it. On LinkedIn, it's free to send contact request, when you send a contact request to person A you have a chance to send them a short message, in this message you can quickly introduce your company, goal, products etc. When they accept your contact request (that mostly they do if you have a good profile and affiliate on LinkedIn), you can send them as much as messages you wish. You just need to think about the content of each message and choose strategically good marketing words. You see, it's free, you just need to hire someone with affiliation, and it's nice if this person would have a premium account, it would have a positive effect in accepting the contact request.
Please feel free to drop me a message, we can talk about it further, I would be glad to assist you.
Regards,
Hannaneh