When you rent a beat or instrumental online, you are in debt with them, directly or indirectly. You can't easily promote or label those beats and instruments as yours. No matter how high the value of your beats is, you are not eligible to label them as yours at all unless you own them.
While you own the beat, purchasing exclusively is the best and most accurate way; it gives you ownership of those beats that you've purchased from the sites. There's an advantage that some sites even offer 3 beats in one license, yes you can buy exclusive beats for sale in one license, and provide 3 beats.
Each site has different offers for the exclusive beats they are selling; be smart and invest your money on those beats that are used less, and those beats have been used by very few people.
You have the right over those beats when you buy exclusive beats; you can even sell those beats for a better offer.
You can easily collaborate with any musician using your exclusive beats, who will give you credit along with a reasonable price for the beats.
Circumstances & Circumstances:
The only thing you need to look twice in this matter is the term and condition of the brats you buy from the sites. Please do not sign up for any crazy beats and go through all the criteria and terms. What exactly their stats policy when you buy those beats from them.
Don't disregard the terms and conditions of the exclusive beats that you buy, as few places abuse your mail account by giving you meaningless emails.
Beat Droits:
Be explicit about your rights to a single beat or instrumental that you have purchased. If you are unaware of the exclusive rights over beats or instrumentals, then you are unable to own them and will be in loss.
Read the document carefully on the website, which has all the laws and regulations that specify what kind of rights you have on the beats that you just bought from them, and then doesn't buy from them if you feel worried about it.