In my experience there are a few things that you want to focus on with KPIs, prior to technology - if you have not already.
1. Validate that the calculations are consistent throughout the organization, regions etc.
2. Validate that the selected KPIs are truly indicators that will help drive success.
3. Validate that each KPI and calculation is understood by the people accountable as well as the managers reviewing.
4. Have regular meetings or coaching sessions with staff members and managers to review KPIs.

The display method depends on what technology you have available. If can auto-calculate the data and have it pulled into a dashboard that compares items (by person, over time, locations, groups, etc.) that is great. However, you can do something as simple as a Confluence page or an excel spreadsheet. I find that it is most important to make sure that the data is very clear and concise. People should be held accountable, but they should also have an opportunity to be coached so they can improve. Feel free to give me a call if you would like to discuss in more detail.