Synchronous start of three timers

Hello everyone. Question about synchronous launch of three timers.
Given:
- CPU F0 or F4 or G4 (of course F103 is possible - I just don't like it, personal dislike);
- three timers, each with its own operating frequency, Timers work via DMA, each with its own buffer for PWM generation;
Task:
- simultaneous launch of all three timers;
Limits:
- interrupts are prohibited, no interrupts;

With the same frequency - there are no problems, they start at the same time, but with different frequencies, everything diverges. Tell me if there is a solution.