Yes, ezCheckPrinting software can support unlimited company accounts on the same computer with no extra. Many of our clients are CPAs.

ezCheckPrinting account management
https://www.halfpricesof...aq.asp?t=ACCOUNT#ACCOUNT 

Note:
You can test multiple accounts feature with the free trial version.

ezCheckPrinting Trial Version Free Download Link
http://www.halfpricesoft...ng_software_download.asp 

Quick Start Guide: How to Print Checks on Blank Stock in House
http://www.halfpricesoft...ng-software-add-logo.asp 

Sample checks printed by ezCheckPrinting
https://www.halfpricesof...usiness_sample_check.asp 

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Can I setup to print check for more than 2 different companies on a same computer?
Please advise.