Option 1
Buy a property in cash or 50% mortgage in a really good area where you will attract quality tenants. (D4,6,14,18 ETC)
It's possible but highly unlikely they'll cause you issues and if they do you can take blood from them because they will have careers, money and a reputation to protect.
Option 2
Buy a low cost global equity ETF such as Vanguard FTSE All-World UCITS ETF (USD) Accumulating via Online Broker Trade Republic for example. Hold it for 10-20 years etc. To lower your risk put 40% of your cash in Amundi Prime Euro Government Bonds 0-1Y UCITS ETF DR (C). Also on Trade Republic. You'll average a little over 6% annually and it won't be as volatile as just putting all your money into the 100% equity fund above which would probably only do a bit better at 8% on average annually.
If you buy unit trust funds via the Life Assurance company the tax will be taken care of but the fees kills any real returns. An accountant will sort the the tax due on the ETF at a price but it will be a lot cheaper than the fees you pay and lose with the life companies.