This RuleSet will turn on bots if active deal count is lower than or equals 10 and will turn bots off if active deal count is greater than 10. This RuleSet is of the "Account" type and is therefore only processed once per interval for each account.
You can use such a RuleSet to have more bots enabled and waiting for signals than you actually want. But the number of deals is still limited to a fixed value. This can increase profits.
Depending on the signals selected, it may be possible that the number of active deals can be slightly higher than your limit. E.g. if the automation interval is 10 seconds, but several start signals occur simultaneously within a few seconds.