Yes, thats the disadvantage, but the ARM will have a very hard time in doing so because the system will be just moving and would not have to deploy or undeploy constantly.

You can think of this system like the Pantsir S1, fully autonomous, single vehicle and such and does never have to deploy and such to fire.

As for TOR M1, imho its a nice SHORAD, but a system like the Pantsir S1 has a much higher range and ceiling, yet being much cheaper and a single system.