Yes. But for getting alerts and notifications, there is a limit on the number of trademark applications for which various alerts would be sent. Apart from this, there is no limitation on adding trademark applications in your dashboard, you can see their status, compliance etc. in your dashboard. But, alerts and notifications would be sent, of trademarks selected by you and limit applies on their numbers only.
If you want to get alerts and notifications and threat alerts of more trademark applications than allowed in your subscription plan, you can either upgrade your existing subscription plan or buy one more subscription.