More than one montage use in parallel

I have reviewed past threads and haven't come across this question before so want to ask if

1. it is effective or ill-advised to do more than one momtage in a day, for example doing one montage for anxiety and then doing another for staying awake. 2.Also curious to know if you have an opinion about whether tdcs is more effective than tacs or whether one is better for quicker results and another better for longer-term results.

Thanks in advance.