Google Adsense incorporates autoamtic ad placements.
try to get approved.
AdSense WILL AND DOES automatically insert ads in the header as well as many other types of ads like vignette ads. Adsense is GREAT
a) if you can get approved
b) to minimise your admin effort
c) you don’t mind a lower RPM (in exchange for less effort doing the admin)
d) you have <50% DIRECT traffic
e) you don’t click on ads on your site
f) you have all the necessary cookie consents in place.
adsense is a pay per click
you can combine that with other ad platforms. I use monumetric who pay for ad placements. I find even combining two sources of ads quite hard to manage.
PS you can use AD INSERTER to insert ads anywhere on your site. However…it takes time and requires understanding.
.
.