I'd like to see it in a few locations:

A main page with all non-level (Research, Trophies) bonuses for each tower outside of the game with the base statistic information, EG: 10 DMG 105% (Trophy Icon) 110% (Tower Research Icon) * 110% (Generic Research Icon) = 12.5 (or if these bonuses are multiplicative, 12.7). You might be able to also add a way to show a preview of what the damage would be like if the towers were upgraded or leveled, my first thought is two fields on the page that just lets you put in a # and all displayed towers will be treated as those XP levels or Upgrade levels.

In the level, for all bonuses just for this level, EG: 105% DMG (In level bonus Icon), +10 Starting Money (In level bonus Icon), 115% ATK SPD (In level bonus Icon), 110% Power (Base Icon), +1 Starting Level Basic (Core Icon)

On the Tower ingame, EG: 10 DMG 125% (outside game bonuses, probably no icon) 115% (Inside Game Bonuses) = 14 (or if these bonuses are multiplicative, 14.6)

There is a lot of information to see but the only place to see any of it as a whole is ingame, and it's not very detailed. On top of that, as a player, the amount of time I spend gaining all these bonuses is part of the fun, and I'd like to see my accomplishments laid out before me.