Service for IP Stress Test?

Question

stress testing

Good day.
There was a task to conduct a stress test of the channel on the rented equipment.

It is necessary to create a load on the equipment of incoming and outgoing traffic at 1 - 3 Gbps (at this stage, it does not matter whether it is one connection or many)

Maintain such a load for at least 15 - 30 minutes 3 - 4 times a day, for 2 weeks.

What services can provide such a service, what is the price range?
Is there any option to do this for free, but without creating, for example, a node for TOR, so as not to get a ban from the hosting provider?

Can the results of Python Script Speedtest- Cli be trusted when testing a link over 1Gbps?

iperf can not because I have only 1 piece of iron with a guaranteed wide channel.

LOIC As I understand it, it will just flood with a huge number of connections and not the fact that it will give the desired load.

ipstresstest.com they have Max boot time 1200 Seconds, and as I understand it for the whole month

IP Stresser (referral link) they have a similar service for a maximum of an hour for a month, though there is a trial, well, they do not solve the problem of testing outgoing traffic