You can use RME NetConfig Jobs to deploy access-lists updates to all devices.
1. Go to RME --> ConfigMgmt ---> NetConfig ---> NetConfig Jobs --> Create
2. Select Device Based --> From All devices, select the device you want to add ACL to.
3. From Task Selector --> All Tasks ---> Adhoc --> Add Instance and then populate the IOS parameters with the desired ACL you want to add save and click next to create the job and schedule the deployment.
You might want to try this out on one device first then if successful, move to groups of devices, and so on.