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.

I typically end up doing this in Excel in order to get more granular.

Although your KPIs are supposed to be the most important overall metrics of your company, each major source of candidate leads, each of your sales teams, the role types, all ultimately drive these KPIs. Monitoring the health of the most important segments you have independently can help you identify changes in performance or help you allocate resources to better performing areas.

For that reason, I usually create a spreadsheet that calculates all of my KPIs, then duplicate it onto additional tabs and plug in the individual data for my most important segments. In your case, segments might be teams (or individual reps if there aren't too many), certain role types you're trying to fill, candidate leads that came from particular sources, etc.

Then, I usually create one tab of graphs that show me how my overall KPIs are trending, and then a long tab with graphs for each KPI broken down and showing me how my most important segments are trending vs one another.

This allows me to see my big picture numbers easily, and also monitor the underlying performance that affects them. Without it, I have found that you can get wins in an area while performing poorer in another and not even notice that your business has started to fare worse with leads from certain sources, or in filling certain roles.