Yes these work for what you are trying to do. I have set a few of these up and here is what I learned:

There are also programmable versions that will give you pulsing action. Don't have a link, but the ones I used are red boards with an LED mode display. Cheap delivery from China.

The board logic operates on different voltages 5/12/24 and have no bearing on the voltage going through the switched circuit. This is important as you look for auxiliary power supplies in the machine.

While you are experimenting, make sure to use external power, like from the utility outlet, to run the motor and the switch itself. I blew more more components than I care to admit.

Diodes and fuses are definitely a good thing. If you are unsure about anything, don't connect it.

You can use multiple inputs if you have diodes on the the switch input wire.

I made a test rig with a motor and switch. You plugged it into the power. It had a source wire to attach to flashers and a ground wire with alligator clips. I used it to find good combinations of shaking on a machine before I committed a full install.

I think it was this one: ebay.com link: DC 12V Multifunction 2 Channel Relay PLC Self lock Cycle Timer Time Delay Switch

It has two channels so you can program 2 different shaker actions.

Why not go crazy?

ebay.com link: 16 Channel 12V 5V Relay Board Module Protection Power Supply For Arduino PIC AVR